JPH11312827A - Light emitting diode - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light-emitting diode, wherein light is emitted over a desired irradiation range by displacing directional angle to a specified directional angle with ease. SOLUTION: A semiconductor light-emitting element 1 which emits light, and a focusing lens 2 which comprising a projecting top part 21, converges the emitted light to discharge light having a directional angle δ with an optical axis 22 as center are provided. Here, the focusing lens 2, a ruggedness 23 which scatters the emitted light to displace the directional angle δ to a specified directional angle δ 1 is provided at the top part 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting diode using a semiconductor light emitting device.

[0002]

2. Description of the Related Art Conventionally, as this kind of light emitting diode,
There is a configuration shown in FIG. This is a semiconductor light emitting element A that emits light, and a convergent lens that has a convex top B1 and converges the emitted light and emits emitted light having a directional angle δ centered on an optical axis B2. B.

More specifically, the converging lens B is made of resin and has a top portion B1 formed in a spherical shape, and emits emitted light having a directional angle δ. The directivity angle δ is, in other words, how wide the emitted light is to be emitted depending on the application, by changing the material of the resin of the converging lens B or, for example, making the converging lens B cloudy. By adding an additive to the resin, the resin is displaced to a predetermined directivity angle δ1. However, in this case, the uneven portion is not provided on the top of the converging lens B.

[0004]

In the above-mentioned conventional light emitting diode, the directional angle δ is changed to a predetermined directional angle δ1 by changing the resin material of the converging lens B or adding an additive to the resin. The emitted light can be emitted over a desired irradiation range depending on the application.

However, changing the resin material or adding an additive to the resin, that is, changing the material of the converging lens B, requires a large number of experiments and a large development period accompanying the experiments, and the predetermined directivity angle δ1 can be easily adjusted. It was difficult to obtain.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to easily change a directional angle to a predetermined directional angle to emit light over a desired irradiation range. It is to provide a diode.

[0007]

According to a first aspect of the present invention, there is provided a semiconductor light emitting device which emits light and a light emitting device having a convex top for converging light emitted. A convergent lens that emits emitted light having a directional angle about the optical axis, wherein the convergent lens scatters the emitted light and displaces the directional angle to a predetermined directional angle. The portion is provided on the top.

According to a second aspect of the present invention, in the first aspect, the converging lens is formed by a mold, and the mold is provided with convex and concave portions corresponding to the concave and convex portions on the top. Configuration.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

Reference numeral 1 denotes a semiconductor light emitting element, which is a silicon substrate 11
And a light emitting layer 12. The silicon substrate 11 is formed in a thin rectangular shape having one surface and the other surface, and has a side of about 0.3 mm, a thickness of about 0.2 mm, and a first conductivity type. It has conductivity and is excellent in strength and heat dissipation. The light emitting layer 12 includes an n-type GaAlAs layer 12a of a first conductivity type and a p-type GaAlAs layer 12b of a second conductivity type, and includes an n-type GaAlAs layer 12a and a p-type GaAlA.
The s layer 12b is sequentially laminated on one surface of the silicon substrate 11, and emits light at the interface between the two layers 12a and 12b.

The one electrode 13a is connected to the silicon substrate 1
1 and the other electrode 13b is p-type GaAlAs
One electrode 13a is provided on the opposite surface to the silicon substrate 11 of the layer 12b, and one electrode 13a is connected to one lead terminal 14a of the pair of lead terminals 14 and the other electrode 13b is connected to the other lead terminal 14b Connected to each other.

Reference numeral 2 denotes a converging lens, which is provided with a convex top 21 formed in a rod shape of resin and formed in a substantially spherical shape, formed by a mold (not shown), and formed along a longitudinal direction. With the shaft 22, the light emitted from the semiconductor light emitting device 1 is converged, and the semiconductor light emitting device 1, the pair of lead terminals 14, and the wire 15 are fixed at predetermined positions.

Here, a plurality of concave and convex portions 23 composed of a concave portion 23a and a convex portion 23b are provided on the entire surface of the top portion 21 by cutting off the top portion 21 to scatter emitted light and to provide a predetermined directional angle δ1. Is emitted with the optical axis 22 as the center. Here, the predetermined directional angle δ1 is enlarged and displaced from the directional angle δ when the uneven portion 23 is not provided. Further, the mold is provided with the concave portion 2 in the uneven portion 23 of the top 21.
Protrusions and depressions corresponding to the projections 3a and the projections 23b are provided, and the projections and depressions form the projections and depressions 23 of the top 21.

The operation of this will be described. Other electrode 13
When a positive voltage is applied to the first electrode 13a and a negative voltage is applied to the one electrode 13a, the light emitting layer 12 becomes the n-type GaAlAs layer 1.
Light is emitted at the interface between the 2a and p-type GaAlAs layers 12b. Since the converging lens 2 has the concavo-convex portion 23 provided on the top portion 21, the light converges and scatters around the optical axis 22 and is displaced by an enlarged displacement with respect to the directional angle δ to have a predetermined directional angle δ1. Emits light. In other words, the converging lens scatters the emitted light in the concavo-convex portion and expands and disperses the directional angle δ to the predetermined directional angle δ1, so that the expanded and displaced emitted light is irradiated over a desired wide irradiation range.

In the light emitting diode of this embodiment, as described above, since the converging lens 2 is provided with the concavo-convex portion 23 on the top 21, the converging lens 2 is displaced with respect to the directivity angle δ and has a predetermined directivity angle. The emitted light having δ1 is
, The directional angle δ can be easily shifted to the predetermined directional angle δ1, and the emitted light can be applied over a wide irradiation range.

Since the concave and convex portions corresponding to the concave and convex portions 23 of the top portion 21 are provided on the mold, the concave and convex portions 23 can be easily formed on the top portion 21 of the converging lens 2 by using a mold, and the reproducibility is good. Can be manufactured in large quantities.

In the present embodiment, the concavo-convex portion 23 is provided on the entire surface of the top portion 21 of the converging lens 2, but is provided not on the entire surface portion but on a part of the top portion 21 so that the predetermined directivity angle δ1 is a desired value. May be displaced at an angle, ie, various irregularities 2
3 to set an arbitrary predetermined directional angle δ1,
Not limited.

In the present embodiment, the first conductivity type is n.
Although the semiconductor light emitting device 1 is formed with the mold and the second conductivity type being p-type, the first conductivity type may be p-type and the second conductivity type may be n-type, and there is no limitation.

[0019]

According to the first aspect of the present invention, since the converging lens has the concavo-convex portion on the top, the converging lens is displaced with respect to the directional angle and emits light having a predetermined directional angle about the optical axis. Thus, the directional angle can be easily changed to a predetermined directional angle, and the emitted light can be applied over a wide irradiation range.

According to the second aspect, in addition to the effects of the first aspect, if the converging lens is formed by a mold, the concave and convex portions corresponding to the concave and convex portions on the top are formed on the mold. Since it is provided, the concave and convex portions can be easily formed on the top of the converging lens by using a mold, and can be mass-produced with good reproducibility.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention.

FIG. 2 is a front view of the same.

FIG. 3 is a plan view of the same.

FIG. 4 is a partially cutaway front view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Semiconductor light emitting element 2 Convergent lens 21 Top 22 Optical axis 23 Uneven part δ Direction angle δ1 Predetermined directivity angle

Claims (2)

[Claims] 1. A semiconductor light emitting device that emits light, and a convergent lens that has a convex top and converges the emitted light and emits emitted light having a directional angle about the optical axis. The light emitting diode according to claim 1, wherein the converging lens is provided on the top with a concave / convex portion for scattering the emitted light and displacing the directional angle to a predetermined directional angle. 2. The light-emitting diode according to claim 1, wherein the converging lens is formed by a mold, and the mold is provided with concave and convex portions corresponding to the concave and convex portions on the top portion, respectively. .